An old man rests his head on his hand; cherubs play in a room filled with mechanical instruments; representing mechanical philosophy (or 18th century physics). Stipple engraving by J. Chapman, 1816.

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An old man rests his head on his hand; cherubs play in a room filled with mechanical instruments; representing mechanical philosophy (or 18th century physics). Stipple engraving by J. Chapman, 1816. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.